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| From: | Dong Xu Wang |
| Subject: | Re: [Qemu-devel] [PATCH V13 4/6] create some QemuOpts functons |
| Date: | Tue, 07 May 2013 15:53:49 +0800 |
| User-agent: | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 |
On 2013/5/7 15:38, Markus Armbruster wrote:
Dong Xu Wang <address@hidden> writes:On 2013/5/6 20:20, Markus Armbruster wrote:Dong Xu Wang <address@hidden> writes:These functions will be used in next commit. qemu_opt_get_(*)_del functions are used to make sure we have the same behaviors as before: after get an option value, options++.I don't understand the last sentence.
I will make the sentence clear next version. In block layer, I created 2 series of functions:1) one is qemu_opt_get_del series, it is used to parse create options, after parsing one parameter, will delete it. 2) the other is qemu_opt_replace_set series, it will delete related opt and then add a new one.
Here I made a mistake, it should use def_value_str, will fix in next version.Signed-off-by: Dong Xu Wang <address@hidden> --- include/qemu/option.h | 11 +++++- util/qemu-option.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++---- 2 files changed, 105 insertions(+), 9 deletions(-) diff --git a/include/qemu/option.h b/include/qemu/option.h index c7a5c14..d63e447 100644 --- a/include/qemu/option.h +++ b/include/qemu/option.h @@ -108,6 +108,7 @@ struct QemuOptsList { }; const char *qemu_opt_get(QemuOpts *opts, const char *name); +const char *qemu_opt_get_del(QemuOpts *opts, const char *name); /** * qemu_opt_has_help_opt: * @opts: options to search for a help request @@ -121,13 +122,18 @@ const char *qemu_opt_get(QemuOpts *opts, const char *name); */ bool qemu_opt_has_help_opt(QemuOpts *opts); bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval); +bool qemu_opt_get_bool_del(QemuOpts *opts, const char *name, bool defval); uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval); uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval); +uint64_t qemu_opt_get_size_del(QemuOpts *opts, const char *name, + uint64_t defval); int qemu_opt_set(QemuOpts *opts, const char *name, const char *value); +int qemu_opt_replace_set(QemuOpts *opts, const char *name, const char *value); void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value, Error **errp); int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val); int qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val); +int qemu_opt_replace_set_number(QemuOpts *opts, const char *name, int64_t val); typedef int (*qemu_opt_loopfunc)(const char *name, const char *value, void *opaque); int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque, int abort_on_failure); @@ -144,7 +150,10 @@ const char *qemu_opts_id(QemuOpts *opts); void qemu_opts_del(QemuOpts *opts); void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp); int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname); -QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params, int permit_abbrev); +int qemu_opts_do_parse_replace(QemuOpts *opts, const char *params, + const char *firstname); +QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params, + int permit_abbrev); void qemu_opts_set_defaults(QemuOptsList *list, const char *params, int permit_abbrev); QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict, diff --git a/util/qemu-option.c b/util/qemu-option.c index 0488c27..5db6d76 100644 --- a/util/qemu-option.c +++ b/util/qemu-option.c @@ -33,6 +33,8 @@ #include "qapi/qmp/qerror.h" #include "qemu/option_int.h" +static void qemu_opt_del(QemuOpt *opt); + /* * Extracts the name of an option from the parameter string (p points at the * first byte of the option name) @@ -549,6 +551,16 @@ const char *qemu_opt_get(QemuOpts *opts, const char *name)const char *qemu_opt_get(QemuOpts *opts, const char *name) { QemuOpt *opt = qemu_opt_find(opts, name); const QemuOptDesc *desc; desc = find_desc_by_name(opts->list->desc, name); return opt ? opt->str :(desc && desc->def_value_str ? desc->def_value_str : NULL); } +const char *qemu_opt_get_del(QemuOpts *opts, const char *name) +{ + QemuOpt *opt = qemu_opt_find(opts, name); + const char *str = opt ? g_strdup(opt->str) : NULL; + if (opt) { + qemu_opt_del(opt); + } + return str; +} +Unlike qemu_opt_del(), this one doesn't use def_value_str. Why? Isn't that a trap for users of this function? Same question for the qemu_opt_get_FOO_del() that follow.I'm still interested in answers :)
bool qemu_opt_has_help_opt(QemuOpts *opts) { QemuOpt *opt; @@ -577,6 +589,22 @@ bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval) return opt->value.boolean; } +bool qemu_opt_get_bool_del(QemuOpts *opts, const char *name, bool defval) +{ + QemuOpt *opt = qemu_opt_find(opts, name); + bool ret; + + if (opt == NULL) { + return defval; + } + ret = opt->value.boolean; + assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL); + if (opt) { + qemu_opt_del(opt); + } + return ret; +} + uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval) { QemuOpt *opt = qemu_opt_find(opts, name); @@ -609,6 +637,23 @@ uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval) return opt->value.uint; } +uint64_t qemu_opt_get_size_del(QemuOpts *opts, const char *name, + uint64_t defval) +{ + QemuOpt *opt = qemu_opt_find(opts, name); + uint64_t ret; + + if (opt == NULL) { + return defval; + } + ret = opt->value.uint; + assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE); + if (opt) { + qemu_opt_del(opt); + } + return ret; +} + static void qemu_opt_parse(QemuOpt *opt, Error **errp) { if (opt->desc == NULL) @@ -646,7 +691,7 @@ static bool opts_accepts_any(const QemuOpts *opts) } static void opt_set(QemuOpts *opts, const char *name, const char *value, - bool prepend, Error **errp) + bool prepend, bool replace, Error **errp) { QemuOpt *opt; const QemuOptDesc *desc; @@ -658,6 +703,11 @@ static void opt_set(QemuOpts *opts, const char *name, const char *value, return; } + opt = qemu_opt_find(opts, name); + if (replace && opt) { + qemu_opt_del(opt); + } + opt = g_malloc0(sizeof(*opt)); opt->name = g_strdup(name); opt->opts = opts; @@ -667,7 +717,6 @@ static void opt_set(QemuOpts *opts, const char *name, const char *value, QTAILQ_INSERT_TAIL(&opts->head, opt, next); } opt->desc = desc; - opt->str = g_strdup(value); opt->str = g_strdup(value ?: desc->def_value_str); qemu_opt_parse(opt, &local_err); if (error_is_set(&local_err)) {Here you plug the leak you created in PATCH 1/6.@@ -680,7 +729,29 @@ int qemu_opt_set(QemuOpts *opts, const char *name, const char *value) { Error *local_err = NULL; - opt_set(opts, name, value, false, &local_err); + opt_set(opts, name, value, false, false, &local_err); + if (error_is_set(&local_err)) { + qerror_report_err(local_err); + error_free(local_err); + return -1; + } + + return 0; +} + +/* + * If name exists, the function will delete the opt first and then add a new + * one. + */ +int qemu_opt_replace_set(QemuOpts *opts, const char *name, const char *value) +{ + Error *local_err = NULL; + QemuOpt *opt = qemu_opt_find(opts, name); + + if (opt) { + qemu_opt_del(opt); + }Why? Won't opt_set() delete it already?No, opt_set will not delete it, but add a new opt. In block layer,Then I'm confused...while parsing options, if the parameter is parsed, it should be deleted and won't be used again, so I delete it manually.Same question for the qemu_opt_replace_set_FOO() that follow.+ opt_set(opts, name, value, false, true, &local_err);... because here you pass true for parameter replace, which I (naively?) expect to delete the option. Can you unconfuse me?
Sorry, I used qemu_opt_del twice, will clean.
if (error_is_set(&local_err)) { qerror_report_err(local_err); error_free(local_err); @@ -693,7 +764,7 @@ int qemu_opt_set(QemuOpts *opts, const char *name, const char *value) void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value, Error **errp) { - opt_set(opts, name, value, false, errp); + opt_set(opts, name, value, false, false, errp); } int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val) @@ -740,6 +811,16 @@ int qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val) return 0; } +int qemu_opt_replace_set_number(QemuOpts *opts, const char *name, int64_t val) +{ + QemuOpt *opt = qemu_opt_find(opts, name); + + if (opt) { + qemu_opt_del(opt); + } + return qemu_opt_set_number(opts, name, val); +} + int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque, int abort_on_failure) { @@ -917,7 +998,7 @@ int qemu_opts_print(QemuOpts *opts) } static int opts_do_parse(QemuOpts *opts, const char *params, - const char *firstname, bool prepend) + const char *firstname, bool prepend, bool replace) { char option[128], value[1024]; const char *p,*pe,*pc; @@ -953,7 +1034,7 @@ static int opts_do_parse(QemuOpts *opts, const char *params, } if (strcmp(option, "id") != 0) { /* store and parse */ - opt_set(opts, option, value, prepend, &local_err); + opt_set(opts, option, value, prepend, replace, &local_err); if (error_is_set(&local_err)) { qerror_report_err(local_err); error_free(local_err); @@ -969,7 +1050,13 @@ static int opts_do_parse(QemuOpts *opts, const char *params, int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname) { - return opts_do_parse(opts, params, firstname, false); + return opts_do_parse(opts, params, firstname, false, false); +} + +int qemu_opts_do_parse_replace(QemuOpts *opts, const char *params, + const char *firstname) +{ + return opts_do_parse(opts, params, firstname, false, true); } static QemuOpts *opts_parse(QemuOptsList *list, const char *params, @@ -1008,7 +1095,7 @@ static QemuOpts *opts_parse(QemuOptsList *list, const char *params, return NULL; } - if (opts_do_parse(opts, params, firstname, defaults) != 0) { + if (opts_do_parse(opts, params, firstname, defaults, false) != 0) { qemu_opts_del(opts); return NULL; }
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